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系統識別號 U0026-0507202013485100
論文名稱(中文) 寬度及水砂比影響水下辮狀河道演化之研究 : 實驗與水流模式開發
論文名稱(英文) Study of Submarine Braided Channels in response to Channel Width and Inflow to Sediment Ratio : Experiments and Modeling
校院名稱 成功大學
系所名稱(中) 水利及海洋工程學系
系所名稱(英) Department of Hydraulics & Ocean Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 黃彥鈞
研究生(英文) Yan-Jyun Huang
學號 N86074055
學位類別 碩士
語文別 中文
論文頁數 121頁
口試委員 指導教授-賴悅仁
口試委員-卡艾瑋
口試委員-吳富春
口試委員-陳樹群
中文關鍵字 水下辮狀河道  異重流  寬度效應  水砂比  河道自動化分析  數位影像處理  Topo Toolbox 
英文關鍵字 Submarine braided channel  Density currents  Channel width  Topo Toolbox 
學科別分類
中文摘要 本研究利用小尺度的三維動床水槽,探討水下辮狀河道受寬度限制與水砂比差異之形貌演化發展,也是首次對於水下辮狀河道進行寬度差異分析比較的實驗。從研究的結果顯示,寬度效應與水砂比差異均是左右水下辮狀河道發展的變因之一,但也發現兩者似乎分別從不同的角度切入去影響水下辮狀河道的演化與發展。從定性的觀察中發現,寬度效應主導了水下辮狀河道的演化機制,而水砂比差異則影響水下辮狀形貌的發展程度,且在寬度效應與水砂比差異的共同影響下,寬度效應對於水下辮狀河道整體的形貌發展有更顯著的影響力。此外,在許多定量分析的結果均表示,水下辮狀河道與陸上辮狀河道間存在相似的趨勢,再次確定水下辮狀河道與陸上辮狀河道的相似性。

最後,對於在實驗室中無法取得並量測的水下異重流流量,本研究透過對無限方向演算法進行修正並結合Topo Toolbox進行水流累積模擬,除了可以模擬異重流於當下數值高程模型中的流路外,也能透過加總任一橫斷面上的流量,取得異重流的流量資料,但仍缺乏全域實際流量分布之資料佐證。
英文摘要 In this study, we used small-scaled physical model to observe the evolution of the submarine braided channel morphology that is limited by the initial channel width and inflow to sediment ratio. It is also the first experiment to compare the difference of the submarine braided channel width. The results show that all of the difference channel width and inflow to sediment ratio affect the development of submarine braided channel in different ways.

From the quantitative results, we found that the channel width dominates the evolution of the submarine braided channel, and the inflow to sediment ratio affects the development of the submarine braided channel morphology. Under the common influence of channel width and inflow to sediment ratio, the channel width has a more significant influence on the overall development of the submarine braided channel.

In addition, the results of quantitative analysis indicate that there are similarity between submarine braided channel and braided channel, so we can compare the similarity between them.

Finally, we modified the flow algorithm and combined it with Topo Toolbox to simulate the flow path of density currents and predict the discharge in any cross section, but there is still lack of evidence for the actual flow distribution in the whole area.
論文目次 目錄
摘要 I
致謝 XII
目錄 XIII
表目錄 XV
圖目錄 XVI
第一章 緒論 1
第二章 實驗配置 6
2-1 實驗水槽配置 6
(i) 水槽尺寸 7
(ii) 觀察區段 9
(iii) 砂水系統 11
(iv) 測量系統 12
2-2 實驗砂材選擇 15
2-3 實驗組數參數 15
2-4 實驗流程 18
2-5 問題與解決 19
(i) 水質渾濁 19
(ii) 積砂問題 21
(iii) 懸浮漂砂 22
第三章 數位影像處理 23
3-1 座標轉換理論 23
3-2 影像處理分析 25
3-2-1 校正 25
3-2-2 影像處理 26
(i) 檔案格式轉換 26
(ii) 雷射切頁影像處理 27
(iii) 雷射切頁分析 29
3-2-3 數值高程模型建置 30
3-3 問題與解決 32
第四章 地表分析 36
4-1 正射影像 36
4-2 數值高程差異圖 51
4-3 動態河道自動化分析 66
4-3-1 辮狀強度指數 66
4-3-2 分析方法 67
4-3-3 分析結果 70
4-4 水下辮狀河道之量化分析 74
4-4-1 穩定性理論分析水下辮狀系統 74
4-4-2 辮狀強度指數與水流功率之關係 77
4-4-3 辮狀強度指數與體積變化之關係 79
第五章 水流累積模式於水下辮狀河道之應用 81
5-1 Topo Toolbox 81
5-1-1 初始水流設定 81
5-1-2 流向演算法 82
(i) 最大坡降演算法 82
(ii) 無限方向演算法 84
(iii) 流向演算法之修正 86
5-2 水流累積分析步驟 91
5-3 水流累積模擬之分析結果 94
第六章 問題討論與結論建議 106
6-1 河寬效應對水下辮狀河道發展之影響 106
6-2 不同的水砂比對水下辮狀河道的影響 108
6-3 河寬效應與水砂比差異的共同影響下,水下辮狀河道的發展趨勢 112
6-4 結論 114
6-5 未來建議 114
參考文獻 118

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